Download or read book The Evolution of the Nevadaplano from Construction to Dismemberment written by Nolan Ryan Blackford and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Documenting the kinematic evolution of structural systems, including the dominant mass transfer processes, the geometry and magnitude of strain, and the thermal architecture of deforming crust is fundamental for interpreting deformation processes. In eastern Nevada and western Utah the hinterland of the Sevier orogeny is interpreted to have been high-elevation orogenic plateau (Nevadaplano) that experience a punctuated tectonothermal event during the late Cretaceous followed by orogenic collapse and high-magnitude Eocene-Oligocene extension. In order to elucidate the kinematic evolution of orogenic crust and its subsequent collapse, we present peak thermal conditions of the Nevadaplano during the Late Cretaceous and investigate the magnitude of subsequent metamorphic core complex extension in the Northern Snake Range, Nevada, USA. Finally, we provide new equations that compare quartz crystallographic preferred orientation fabric intensities with finite strain magnitude calculated from the Northern Snake Range, providing a new method to quantify finite strain magnitude in quartz rich tectonites in regions where deformation markers may be absent or destroyed.At the latitude of ~39 ℗ʻN, thermal field gradients of 29℗ł3 ℗ʻC/km were obtained in the House and Confusion Ranges in westernmost Utah. The Deep Creek, Schell Creek, and Egan Ranges in easternmost Nevada yielded elevated gradients of 49℗ł7 ℗ʻC/km, 36℗ł3 ℗ʻC/km, and 32℗ł6 ℗ʻC/km, respectively. Moving westward, the White Pine, Butte, Pancake, and Fish Creek Ranges exhibit gradients typically between ~20-30 ℗ʻC/km. The elevated thermal gradients in easternmost Nevada are interpreted to have been attained during ~70-90 Ma granitic magmatism and metamorphism, and imply possible partial melting at 9́Æ18 km depths. Our data are compatible with published interpretations of Late Cretaceous lithospheric mantle delamination under the Sevier hinterland, which triggered lower-crustal anatexis and the resulting rise of granitic melts.Following the end of the Sevier orogeny, metamorphic core complexes locally accommodated high-magnitude extension following the collapse of the Sevier orogenic plateau. The footwall of the Eocene-Oligocene Northern Snake Range decollement (NSRD) and west-adjacent Schell Creek Range detachment system, eastern Nevada, preserves a coherent stratigraphy of ductilely deformed Neoproterozoic-Cambrian metasedimentary rocks that are exposed over a 60 km transport-parallel distance, providing an ideal opportunity to quantify ductile strain. Our data demonstrate a dramatic finite strain gradient in the transport direction, from 119% horizontal extension and 59% vertical thinning at the western flank of the Northern Snake Range to 450-1390% extension and 81-94% thinning at the eastern flank. The footwall underwent 18-20 km of cumulative ductile extension, equivalent to 38-43% of the total extension accommodated on brittle structures. Our data are compatible with a rolling hinge model of extension, where brittle displacement on a low-angle detachment was fed downward to a zone of distributed, simple shear-dominant, top-down-to-ESE ductile shearing beneath the quartz crystal-plastic transition, and footwall exhumation progressively migrated eastward.Quantifying finite strain magnitude in the Northern Snake Range is made difficult due to pervasive recrystallization that typically occurs within ductile shear zones and often destroys deformed markers from which finite strain can be measured. Here, we present equations that relate fabric intensity parameters (cylindricity and density norm) to finite strain magnitude. We measured fabric intensity parameters from 77 samples and incorporated 12 published samples across the width of the NSRD footwall and compare fabric intensity parameters to our finite strain data. Finite strain magnitude and fabric intensity increase rapidly up to tectonic strain values of ~20-25, at which point the correlative increase in fabric intensity diminishes with increasing finite strain. We present equations that express fabric intensity as a function of finite strain, and vice versa. The equations presented here can be used to provide a first-order estimate of finite strain magnitude within any ductile shear zone from which quartz fabric intensity can be measured.
Download or read book Ancient Landscapes of Western North America written by Ronald C. Blakey and published by Springer. This book was released on 2017-10-03 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Allow yourself to be taken back into deep geologic time when strange creatures roamed the Earth and Western North America looked completely unlike the modern landscape. Volcanic islands stretched from Mexico to Alaska, most of the Pacific Rim didn’t exist yet, at least not as widespread dry land; terranes drifted from across the Pacific to dock on Western Americas’ shores creating mountains and more volcanic activity. Landscapes were transposed north or south by thousands of kilometers along huge fault systems. Follow these events through paleogeographic maps that look like satellite views of ancient Earth. Accompanying text takes the reader into the science behind these maps and the geologic history that they portray. The maps and text unfold the complex geologic history of the region as never seen before. Winner of the 2021 John D. Haun Landmark Publication Award, AAPG-Rocky Mountain Section
Download or read book Ophiolites Arcs and Batholiths written by James Earl Wright and published by Geological Society of America. This book was released on 2008-01-01 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wright (geology, U. of Georgia) and Shervais (geology, Utah State U.) edit selections from a symposium titled "Ophiolites, Batholiths, and Regional Geology: A Session in Honor of Cliff Hopson" held at the Cordilleran Section Meeting of The Geological Society of America in 2005. With contributions from geologists and earth scientists from throughout the United States, the title contains separate sections for papers on the topics of ophiolites, arcs, and batholiths. The publication is illustrated in both black-and-white and color, but contains no index.
Download or read book Exposed Cross Sections of the Continental Crust written by M.H. Salisbury and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the Fall of 1988, 64 geologists and geophysicists from 11 countries met in Killarney, Ontario, on the north shore of Lake Huron to examine evidence that suggests that the continental crust is exposed in cross-section at several key locations on the Earth's surface. The meeting, which was held under NATO auspices as an Advanced Study Institute, was a landmark event in that it was the first time that many of the lead scientists working on these complexes in relative isolation around the world had' ever gathered together to compare results. The present volume is a compendium of the invited lectures given on the principle sections, plus an array of supporting papers on these and other sections as well as on related topics such as crustal emplacement mechanisms, deformation and rheology. Nearly all of the best known sections are represented, including the Ivrea Zone, Calabria, the Kapuskasing Zone, Fiordland and many others. It is our hope that this Volume will serve as a reference for Earth scientists who are trying to understand levels of the crust not normally exposed to view, as well as a point of departure for new research and a teaching aid to new entrants in this relatively new field of study.
Download or read book Metamorphism and Crustal Evolution of the Western United States written by Wallace Gary Ernst and published by . This book was released on 1988 with total page 1176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Concepts and Discoveries written by William M. Pennell and published by DEStech Publications, Inc. This book was released on 2015-06-12 with total page 719 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientific analyses of the geology, metallogeny, and mineralization of gold, silver and other high-value elements in the western USATechnical details on working mines, exploration results, new depositsPresentations produced with the United States Geological Survey, Society of Economic GeologistsTwo-volume book set printed in full color with full-text searchable CD-ROM Produced under the auspices of the Geological Society of Nevada and published every five years, this two-volume book of peer-reviewed papers focuses on the geological analysis of ore-rich deposits in the western United States, especially ones containing gold and other high-value elements. Hundreds of stratigraphic, lithographic, remote-sensing and core sample examples are presented, particularly of areas likely to host Carlin-type gold deposits. The two volumes contain a wealth of data on specifically named mines, as well as technical information on high-potential areas for exploration. The book is profusely illustrated with full-color maps, photographs and charts for geology and mining engineering. A searchable CD accompanies the book and includes the full text of papers from the printed book, as well as abstracts and information from poster sessions not found in the printed book. Chapters in the text are fully refereed versions of presentations originally delivered at a symposium supported by the Geological Society of Nevada, along with the United States Geological Survey, Society of Economic Geologists and the Nevada Bureau of Mines. Sample key words: metallogeny, gold, epithermal ore, magmatism, Carlin trend, square array void mapping (SAVM), porphyry copper, tungsten, orogeny, lithogeochemistry, 3-D resistivity and modeling, fault-surface mapping, airborne electromagnetics and more. *The CD-ROM displays figures and illustrations in articles in full color along with a title screen and main menu screen. Each user can link to all papers from the Table of Contents and Author Index and also link to papers and front matter by using the global bookmarks which allow navigation of the entire CD-ROM from every article. Search features on the CD-ROM can be by full text including all key words, article title, author name, and session title. The CD-ROM has Autorun feature for Windows 2000 or higher products and can also be used with Macintosh computers. The CD includes the program for Adobe Acrobat Reader with Search 11.0. One year of technical support is included with your purchase of this product.
Download or read book Geologic Field Trips to the Basin and Range Rocky Mountains Snake River Plain and Terranes of the U S Cordillera written by Jeffrey Lee and published by Geological Society of America. This book was released on 2011 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compiled for the 2011 joint meeting of the GSA Rocky Mountain and Cordilleran Sections, this field guide provides an introduction to some of the remarkable geology of the Rocky Mountain and Cordillera regions.
Download or read book Ancient Landscapes of the Colorado Plateau written by Ronald C. Blakey and published by . This book was released on 2008 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Imagine seeing the varied landscapes of the earth as they used to look throughout hundreds of millions of years of earth history. Tropical seas lap on the shores of an Arizona beach. Immense sand dunes shift and swirl in Sahara-like deserts in Utah and New Mexico. Ancient rivers spill from a mountain range in Colorado that was a precursor to the modern Rockies. Such flights of geologic fancy are now tangible through the thought-provoking and beautiful paleogeographic maps, reminiscent of the maps in world atlases we all paged through as children, of Ancient Landscapes of the Colorado Plateau.Ron Blakey of Northern Arizona University is one of the world's foremost authorities on the geologic history of the Colorado Plateau. For more than fifteen years, he has meticulously created maps that show how numerous past landscapes gave rise to the region's stunning geologic formations. Ancient Landscapes of the Colorado Plateau is the first book to showcase Blakey's remarkable work. His maps are accompanied by text by Wayne Ranney, geologist and award-winning author of Carving Grand Canyon. Ranney takes readers on a fascinating tour of the many landscapes depicted in the maps, and Blakey and Ranney's fruitful collaboration brings the past alive like never before.Features: More than 70 state-of-the-art paleogeographic maps of the region and of the world, developed over many years of geologic research Detailed yet accessible text that covers the geology of the plateau in a way nongeologists can appreciate More than 100 full-color photographs, diagrams, and illustrations A detailed guide of where to go to see the spectacular rocks of the region
Download or read book Plates Plumes and Planetary Processes written by Gillian R. Foulger and published by Geological Society of America. This book was released on 2007 with total page 1012 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents a collection of papers discussing various hypotheses and models of planetary plumes.
Download or read book Revising the Revisions written by A. M. Celâl Şengör and published by Geological Society of America. This book was released on 2020-12-07 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: "James Hutton's 'Theory of the Earth,' first published in 1785, was considered completely new by his contemporaries, different from anything that preceded it, and widely discussed both in Hutton's own country and abroad-from St. Petersburg through Europe to New York. Yet a recent trend among some historians of geology is to characterize Hutton's work as already behind the times in the late eighteenth century and remembered only because some later geologists found it convenient to represent it as a precursor of the prevailing opinions of the day. Painstakingly researched, richly referenced, and full of interesting stories, this Memoir shatters that line of thinking and restores Hutton's standing as the father of modern geology, his ideas fully relevant to the geological problems of his day"
Download or read book Synextensional Magmatism in the Basin and Range Province written by Phillip B. Gans and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Method Modeling written by Valerie Cragin and published by Petersen Publishing Company. This book was released on 1980-08 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Founders of Geology written by Archibald Geikie and published by . This book was released on 1897 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Idaho Rocks written by Reed Stone Lewis and published by Mountain Press. This book was released on 2020 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: To discover the unworldly geologic novelties of the Gem State, all that is required is a good map, a sense of adventure, and Idaho Rocks!, a guide to 60 of the most compelling geologic sites in Idaho. The well-chosen destinations span the state's geologic history from the 2.6-billion-year-old gneiss in the Panhandle to 2,000-year-old lava at Craters of the Moon, and from gold and silver deposits hidden in Idaho's mountains to visible scars from recent earthquakes and landslides. With its beautiful photographs and informative figures and maps, this guidebook will get you up to speed on every aspect of Idaho's diverse geology. Northern and central Idaho's sparkling rivers flow past algal mounds in 1.4-billion-year-old limy sediments, sandy beaches eroded from crystalline granite, and exotic rocks of ancient volcanic islands. Southern Idaho has been shaped by calderas of the Yellowstone hot spot, along with active faults of the Basin and Range, and one monumental flood that carried boulders the size of cars. Rock hounds can search for star garnets along Emerald Creek, zeolite crystals in basalt cavities, and eye-shaped feldspar in ancient gneiss. Fossil enthusiasts can discover leaf imprints at Clarkia Fossil Beds, learn about Pliocene horses at Hagerman Fossil Beds, and contemplate the bizarrely whorled teeth of the buzz saw shark who prowled the sea 290 million years ago when Idaho's phosphate deposits were accumulating.
Download or read book Limnogeology Progress Challenges and Opportunities written by Michael R. Rosen and published by Springer Nature. This book was released on 2021-04-24 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book honors the career of Professor Elizabeth Gierlowski-Kordesch who was a pioneer and leader in the field of limnogeology since the 1980s. Her work was instrumental in guiding students and professionals in the field until her untimely death in 2016. This collection of chapters was written by her colleagues and students and recognize the important role that Professor Gierlowski-Kordesch had in advancing the field of limnogeology. The chapters show the breadth of her reach as these have been contributed from virtually every continent. This book will be a primary reference for scientists, professionals and graduate students who are interested in the latest advances in limnogeologic processes and basin descriptions in North and South America, Europe, Africa, and China. *Free supplementary material available online for chapters 3,11,12 and 13. Access by searching for the book on link.springer.com
Download or read book Great Basin and Sierra Nevada written by David R. Lageson and published by Geological Society of America. This book was released on 2000-01-01 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
